The calc for binary

README.md

Create by https://gist.github.com/CaiJingLong/a299d15b92edc2d09a8a06cf6dd5a1b0

readme.md

sweet-frost-9783

Created with <3 with dartpad.dartlang.org.

main.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: BitMoveExample(),
    );
  }
}

class BitMoveExample extends StatefulWidget {
  @override
  BitMoveExampleState createState() => BitMoveExampleState();
}

class BitMoveExampleState extends State<BitMoveExample> {
  int number = 1;

  String radix() {
    return number.toRadixString(2).padLeft(32, '0');
  }

  @override
  Widget build(BuildContext context) {
    final str = radix();
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: <Widget>[
          Row(
            children: <Widget>[
              for (var i = 0; i < 16; i++) _buildCheck(i, str),
            ],
          ),
          Row(
            children: <Widget>[
              for (var i = 16; i < 32; i++) _buildCheck(i, str),
            ],
          ),
          Row(
            children: [
              FlatButton(
                child: Text('<<'),
                onPressed: () {
                  setState(() {
                    number = number << 1;
                  });
                },
              ),
              FlatButton(
                child: Text('>>'),
                onPressed: () {
                  setState(() {
                    number = number >> 1;
                  });
                },
              ),
            ],
          ),
          Text(number.toString()),
        ],
      ),
    );
  }

  _buildCheck(int i, String str) {
    final s = str[i];
    return Expanded(
      child: InkWell(
        onTap: () {
          final tar = s == '0' ? '1' : '0';

          String bitNumber = '';

          if (i == 0) {
            bitNumber = '$tar${str.substring(1)}';
          } else if (i == str.length - 1) {
            bitNumber = '${str.substring(0, str.length - 1)}$tar';
          } else {
            bitNumber = '${str.substring(0, i)}$tar${str.substring(i + 1)}';
          }
          setState(() {
            number = int.parse(bitNumber, radix: 2);
          });
        },
        child: Text(s),
      ),
    );
  }
}